Lumia 720 Buzzing sound when vibration is on

[Romeo Leonard]

I am facing a slight issue.whenever the phone vibrates i can hear a slight rattling/buzzzing sound from the top of the phone maybe near the camera or earpiece.Is this normal.
Kindly advice 720 users.

 

[montsa007]

I heard the same too at times, anywhich ways am going for a replacement as I have a casing fault